Java Formatter out()用法及代碼示例

out()方法是java.util.Formatter的內置方法，它返回格式化程序輸出的目標。

用法：

public Appendable out()

參數：該函數不接受任何參數。

返回值：該函數返回輸出的目標。

異常注意：如果在調用函數之前關閉了格式化程序，則該函數將引發FormatterClosedException。

下麵是上述函數的實現：

示例1:

// Java program to implement 
// the above function 
  
import java.util.Formatter; 
import java.util.Locale; 
  
public class Main { 
  
    public static void main(String[] args) 
    { 
  
        // Get the string Buffer 
        StringBuffer buffer 
            = new StringBuffer(); 
  
        // Object creation 
        Formatter frmt 
            = new Formatter(buffer, 
                            Locale.CANADA); 
  
        // Format a new string 
        String name = "My name is Gopal Dave"; 
        frmt.format("What is your name? \n%s !", 
                    name); 
  
        // Print the Formatted string 
        System.out.println(frmt); 
  
        // Prints the destination of the output 
        System.out.println("\nDestination: "
                           + frmt.out()); 
    } 
}

輸出：

What is your name? 
My name is Gopal Dave !

Destination: What is your name? 
My name is Gopal Dave !

示例2:

// Java program to implement 
// the above function 
  
import java.util.Formatter; 
import java.util.Locale; 
  
public class Main { 
  
    public static void main(String[] args) 
    { 
        try { 
  
            // Get the string Buffer 
            StringBuffer buffer 
                = new StringBuffer(); 
  
            // Object creation 
            Formatter frmt 
                = new Formatter(buffer, 
                                Locale.CANADA); 
  
            // Format a new string 
            String name = "My name is Gopal Dave"; 
            frmt.format("What is your name? \n%s !", 
                        name); 
  
            // Print the Formatted string 
            System.out.println(frmt); 
  
            // Formatter closed 
            frmt.close(); 
  
            // Prints the destination of the output 
            System.out.println("\nDestination: "
                               + frmt.out()); 
        } 
        catch (Exception e) { 
            System.out.println("Exception is: "
                               + e); 
        } 
    } 
}

輸出：

What is your name? 
My name is Gopal Dave !
Exception is: java.util.FormatterClosedException

參考： https://docs.oracle.com/javase/10/docs/api/java/util/Formatter.html#out()

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注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 Formatter out() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。